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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '779b5bfc51191592c3056fc0bc0d8ff367277575e308566d83b9e33e4a04cc00' 
  AND token = 'grqj8nuWBfgs07f5sJC/hIfxPCctFfTVtDBjdqn/j3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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