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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae040aaf9813dcfe953dce2a6699896329a8742caa0075a540cc488ad80f3e28' 
  AND token = 'nlRFh8yeWuO3/aOjtUibwTRIH9LpVEmKfmeIQ9OuQSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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