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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3806ec75308d738bbe715adefa250b04bb99fc0ad58bc4c4e463b299c61323b0' 
  AND token = 'WBsE5XlE0G1KQAu3l9fEMEy5ysndjHaGyrNDmjqh/5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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