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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f89cc63c1795b8242638bc9b2c48968110ea89c978a3e0df938e4df5307b685f' 
  AND token = 'GDdnMObTWFXkptiqrouu0Md0iE73OZP3SG3X2j9aMRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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