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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bfc69bc634118a60c14310cb6d2626bf9fd3df5fdd208efebc920c954981ea6' 
  AND token = 'e7kiMWFM4Eev7CO424faL3NX/bh0kgUnbpt10X63YSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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