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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136bb3a71120461df42942f297bf323db28103738cbfdee49d61900eb3c62313' 
  AND token = 'M54DP5HGp04ST69Gx5VLUYYq5F3REIWLVv3389UzrSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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