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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884b80f40f7633b3a201cc10029b30b27c1b3efbcc3384ca19facdac7758f0c4' 
  AND token = 'j4edQEla+3D3cBY0kKyW03BA7qiAicHifYI5DYNO8Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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