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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '433171337e51315d6a3ade2db76676572703a3035d4dabc1b74f5e169f5cd54d' 
  AND token = 'GHqCzMfkdKXqYS3bhzwurcrx5b/QAY7CEliVW8fM6zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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