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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5c6967b1e5067396c7d31552048efcdaa725588e18699a31410c4bc7206ef0c' 
  AND token = 'yfk0fXrPjgYevwEc5fj1gMTaTq00j7EQNcEfVwW8B5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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