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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d896240cbb5c776ec961ff109313130ea46d6ff0671e13aaf41b5c68970d827' 
  AND token = 'pkz9b6ymoBvP+T4llfO3LKxJAO9hDialLpAPtydfLxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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