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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e99e96e58d2a4c7b61c6639d612a3ffd897ea001aa3df6c623b8ee35f12cf3bb' 
  AND token = 'Ip92GakJ4DiUgDJQ9xQellA7QLVrRtQQ/mccc/uJDHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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