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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b3209575e0338851827d6a744d48a402c41f7eb1f2ad2e5e36c8193f35e83cf' 
  AND token = 'ODNqm6YztSHIlPHuQkqq4L8Iqb1DLHKIJ8akjCe0ZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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