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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a030a38dfdbf9edd6f4debe3146bea477d2012c583baa7c24959c0c416a9988b' 
  AND token = 'N86+Q29+al4/QpVIzmVeAooz0f7vA+BrUDwVfH22fJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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