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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf09fa85567413604d78daafb362cf4dbe31dce5df81eccf246d27a3da008341' 
  AND token = '/u5EMEff6N/Ka0h5Gu8UDdJ4BJfM5cCpTAKZX1mVLkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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