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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bca99f76fe7bf4d890b74962771906b1ef60a7d2ad348e0170fd4c8dd4e02179' 
  AND token = 'enM1LzvC4LhfdP3Yjd7BeFAJtUlAYBGWxWpfMnSQRpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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