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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86101bc4d049419543bece0bb936e2e08ef45940a323ce4423d59ac1887a4b68' 
  AND token = '3OntmUCNijqwrfXDG3/K2epv3X9EPJQQ0DNfCpDrnNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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