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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8a18e2a32c687b3d25b2227c13d45afd46116e750ff22852eccd2db222b1eff' 
  AND token = 'cQh+Eoyifu3SMbLTpV0KTERerajaKZ6GgU8zvJSc0mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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