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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ae77767abe91653e604ade140c549c1572d855ee7682e19e6eee2e3b2e8b9b8' 
  AND token = 'gPixtnRlGZ/EAAIAVPMC1lifDd/M2F4ocQtTyVrASQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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