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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e5e1be1871b3f246e8cf24b61391a406c0c777bd728549d9d56d630fcbc8bc7' 
  AND token = 'M+liVxSMOjVOaSXYeKoKsduAi6kcd3RiqB5s/NjDmaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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