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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834dd011e4b46805c9b4fc3187d9fffb4f2b2fcf3ef6ac45d08cf89535288027' 
  AND token = 'bpDBhJaY7DeoFeD9A86WVUzoqtaYQJq3jtPoeo4HrU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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