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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b46a4a5d8ea59dd956356e750f58cd674c2792406b56c6e5294d4ab284c0eb3' 
  AND token = 'fPaXWlHyTcznsq3KIpuWXFgsF+KsUZ9UxPwcrdDO228=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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