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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '631592bf7d9bfd6b7e0c17e42e1d2a2616abe61219506cb99dfeec42adc1f757' 
  AND token = 'gx/R0a7HZz/xyv0FMJW3V6zk9vsg9k2EH+IcrsG0mYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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