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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '404a5bc478fa342561e974b316ddbf7733e3e1c75fc3a4adabc4be5eb575ea62' 
  AND token = 'ZuxbCbdYwGuWbpTt3Pz8PZccaC3k/iK5rh9rr/qXR14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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