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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f68447df8eea6b3237eb80185e92043e7e6d77ae2f04cbb446e0e42b4d04e66' 
  AND token = 'wa51u/wC+M2ru1s4QafNOVIctoEqTw4YJ52zwhnCWc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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