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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa9b3ef9ad11192bd8d083b1f3732820b86e1febb29dda44bc83e7a6e012921b' 
  AND token = 'hpam2QuVi+u4ADONZc1t5ozj4gFdGUTInz11UA6uonI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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