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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdbf5b68429b166d21d8694db413589ca77e48fe6ba6b719a6dbf827a4add7ff' 
  AND token = 'CK8aXW5yJSZ8rOOc/9Lw8oxWh5Wcwjj1ieWLGoxgZaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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