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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8d6a4b2c7130435a8cefde34b2a1b5cd870fcbb97309bf72e797e7bba4c8477' 
  AND token = '9UsjjQsSO3nkOdPM2dk084BL5gKCrG7lEBS34Mod5Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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