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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c9b3c17e013e59b7e2e8164c8896b1c05ecee4d9e8069ac6c6096dc6cf1459' 
  AND token = '2rV7ucszQK3zt6OEHFXs90L5+ED/uhkPCMtbZAV311A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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