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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '134801edde91f1f5e4e7e1bb6c8e07f7c34606c07460c957f729574deed20b56' 
  AND token = 'eZXRH2AxUxOJOgY1RQyVMoLsj0Rl5tOWSM3f272TrQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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