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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e19843660a7f02851129f067472d62763e81ff7fa20c70db8b08feae7f9ca93' 
  AND token = 'glyIW21KQQ/WA1e/8dYnltdJhHOi6ILC3JH/ojF3G7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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