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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc0fc1ac8de2109d5693b15a6c619f0c36afcfe58af14e1f867811d809515df9' 
  AND token = 'NQcupO2amar6p7CF492eS9xz3j2LU5y6kbIDHfldEjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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