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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd261f92692022976f070b8f5d2dbe46cfb5f0169f902a6c34fe5be41120270e5' 
  AND token = '1c2a7eO/FCxnUr1J/WT5A79djwcqyd7R6dMgHI8FTp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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