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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '929e9fe9eb5829c1b44a67d94b4cb446e90059c86e61c8cb17169e14e5e09f54' 
  AND token = '4i2hKZzUdm8Vz7nZgWd3vLn1KKQ7mn4W+ExioKhtqvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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