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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26356192b421c3f043e0988d8ccdc7fd5a85cc4bf1c7f99bf580af0faa2146f3' 
  AND token = '2+krkW692P4iLCP272TgXVJ9ZaTCoZRP688msi0xMdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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