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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a51794cb0cae9be137893d3111e068f8597a79a5cebe377f22f827bbbc05214a' 
  AND token = 'lTVjW29SkpV7VcDHQlaWEQSrG9752wODgPYbiPWo4pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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