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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecba48158b4ea230c362b920c014aaf35ba4f8eee6ce1d99a884646ecc926745' 
  AND token = '2sqqJnTBpINdPgN8U1FmxJ96caJBrz7U5RT9zuf/eF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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