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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7cd5c56cb0967544b5b38e527ec1e9ee1652708d5e9b85d550d415da146c3a' 
  AND token = 'dI7ZJzlUMUK80u+zS7qXoINKzsxPAXzif+Ox5WoNbjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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