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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '954f2969af2f6fd7bd0b9efcaad8413bcdf8659ba285417f8eb2db9d7e494198' 
  AND token = '9XE5thfzJUvt7WDyRXOt6R//BgiiBemfH/24sJTH9pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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