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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86e08fd9b3cf4d57170a0cb37d8d72a6dd2350bc88aa934408b874ace438c331' 
  AND token = 'hX/dODOyrHY//gXjwfrwjMt2jWbuBN7bMn/tHv5mW5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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