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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '309270501a1db885e3387c8535f51b03c8d220d19f36efbbacd14356e1733da3' 
  AND token = 'xuOnipXkIXQLTdr3son3tFl5aKjTcq5Nhd7iJrkgBxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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