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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ada9ef0f68e6d7ef0d247212522a7a96da557999fd6fb406685e6b9fd01eb26' 
  AND token = 'Gy7QTwvVmC2l1uHShVV9/VbZ0zt3x1DuE2DO1iDKRPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}