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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b6e33088e8acdc488adac0ac9b6a2a9a4038e23b42325a3fedb67bb0b99c82d' 
  AND token = 'uunq6+OCnYPKAjGSYabfMswPFYpN6+h2Rqi5sq8/Jc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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