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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba4946bd367aecea9da52c8490d820f405155c694c6c854e11b1b616518b2d54' 
  AND token = 'hNrnt0XOGHkSfdYlNw5j5NDzsLwRQbewvi6FZCH18yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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