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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '402099922f8aa8ad599be86464753e8224649d76bd4d4f997efefc78dfe43eef' 
  AND token = 'cbH2CzzZWeSXHfRFz6Al0kF1fdds0zy+mnR+P4jZJ80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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