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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df8bd04543d08c9f5b7d7729e79ba801ffef6581da5ed8e882691c5f34fa4dc4' 
  AND token = 'I61rs/qdcSyFIcc9f5sN4y5mXi17fwaSS1P1TcJ7xlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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