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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f3ee19a3209f8987796dd1af06987bfc76f40893c0ca094e58c0db6338ff7cd' 
  AND token = 'g+4Y0dQOioPatd108CqK3bSy85/FtXLwcqByRvVv0QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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