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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '858a690392b1ca903c5832360082af79e2689973ab0af87164fae5488f0d52b7' 
  AND token = 'fQJDHe0xxnw9wUfLSaqID1OJ5voOA0BdWNkblVEVX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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